They want to be parents. They don't want the march necessarily. They're finding each other through co-parenting websites. We have the kid, share all the responsibility and just skip over the whole marriage and divorce nightmare. Reporter: It's a concept we have seen on the big screen. Like in the movies, friends with kids. I can't tell if you're kidding right now. Reporter: But having baby with a friend. With no relationship string attacked? It's called co-parenting. Websites like modamily are popping up. It works like a dating sight. LIKE A MATCH.COM OR eHARMONY. Reporter: Dawn had just ended a long-term relationship with her boyfriend hen she met fabian on a website in 2011. I was feeling that my biological clock was ticking. Seemed like this was the way to go. Reporter: Fabian e-mailed her. They quickly met. It's a gay male seeking a female partner. The thing about dawn that got me right away was her sense of humor. Reporter: One year later, their biological daughter, indigo claire, was born. More than 5,000 people have signed up on modamily alone. When you find a co-parent, do background checks. They're wading in murky waters legally. They may end up in a situation where one is not the legal parent or, where there is a dispute over custody of the child. Reporter: Dawn and fabian are aware of the legal pitfalls. They're taking life one day at a time. Despite living apart, he skypes with them every day. Give kisses to daddy. Give me a kiss. If I listened to everybody that said not to do it, indy wouldn't be here. Those same people are loving her today. Reporter: For "good morning america," abbie boudreau, abc newsangeles. As you might imagine, a lot of people weighing in on twitter. Ma cat fish 2004, you need to know the other person to know how you'll parent. Kids need parents on the same page. Fair enough. Dan, could be a new meaning to friends with benefits. Yes, it could, dan. At least until high school graduation.

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